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SYMPOSIUM 1 - Magnetic Fragmentation in Frustrated Magnetic Systems
¨ Organiser: Michel Gingras
¨ Title: Magnetic Fragmentation in Frustrated Magnetic Systems
¨ Chairman: Piers Coleman
¨ Abstract: Long-range ordered magnetic systems have quantized low-energy collective magnon excitations. In quantum spin liquids, which show no long-range order, low-lying excitations are deconfined quasi-particles with fractional quantum numbers. While a spin-liquid ground state is typically viewed as an alternative to magnetic order, a recent development is the recognition that spin-liquid physics can coexist with conventional magnetic order. This can occur through a “fragmentation” of the magnetization field into two quasi-independent sets of degrees of freedom, one of which orders and the other of which remains fluctuating in a spin-liquid-like manner. This invited symposium will review exciting recent progress and new developments in this area
- Peter Holdsworth, Laboratoire de Physique - Ecole Normale Supérieure, Lyon
Emergent electrostatics and magnetic moment fragmentation in spin ice materials
- Sylvian Petit, LLB-Orphée, Sacley
Quantum fragmentation in Nd2Zr2O7
- Martin Mourigal, Georgia Institute of Technology, Atlanta
Kagome Ising physics realized in bulk magnets: the RE3Mg2Sb3O14 family
- Elsa Lhotel, Institut Néel CNRS, Grenoble
Fragmentation from magnetic charge injection in spin ice
- Nicolas Rougemaille, Institut Néel CNRS, Grenoble
Fragmentation of magnetism in artificial kagome spin ice
- Owen Benton, Okinawa Institute of Science and Technology Graduate University, Onna
The quantum origins of moment fragmentation in Nd2Zr2O7
(12 + 3min)
SYMPOSIUM 2 - Topological states, the case of SmB6
¨ Organiser: Peter Riseborough
¨ Title: Topological states, the case of SmB6
¨ Chairman: Peter Riseborough + Steffen Wirth
¨ Abstract: SmB6 has been proposed as being a strongly correlated Topological Insulator and is a subject of rapidly growing interest. The earliest evidence that SmB6 is not a simple Kondo Insulator is that, although the resistivity of SmB6 shows activated behavior at high temperatures, it plateaus around 4 K. This is in direct contrast with the conventional picture of bulk Kondo Insulators in which the system becomes gapped at low temperatures, due to the formation of a hybridization gap. Two scenarios have evolved which suggest that the system has either metallic surface states (2-d) as in a Topological Insulator or bulk (3-d) in-gap states. The Topological Insulator interpretation suggests that topologically protected surface states should appear at exactly the same temperature at which the bulk gap opens up [M. Dzero]. In this symposium, recent surface sensitive tunneling [H. Pirie] and planar conductance measurements [W-K Park] will be presented that show the temperature evolution of surface states at temperatures significantly larger than the universal plateau value of 4 K. The interpretation of the observed temperature evolutions may be complicated by the existence of low-energy magnetic modes (spin-excitons). The 2-d interpretation is supported by the observation of puzzling hysteric properties [Y. Nakajima] that indicate that the surface may have undergone a magnetic transition. Other experiments are to be presented that support the existence of 3-d bulk in-gap states, probably caused by Sm vacancies [N. Drichko], that produce an anomalously large ac conductivity [N. Laurentia].
- Yasuyuki Nakajima, University of Central Florida
Chiral Edge Transport in the Topological Kondo Insulator SmB6
- Maxim Dzero, Kent State University
Unconventional Physics of conventional Kondo Insulators
- Natalia Drichko, Johns Hopkins University
Breakdown of the Kondo Insulating State in SmB6 by the Introduction of Sm vacancies
- Nicholas Laurita, Johns Hopkins University
Anomalous 3D bulk AC conduction within the Kondo gap of SmB6 single crystals
- Wan-Kyu Park, NHMFL Tallahassee
Topological nature of the Kondo Insulator SmB6 unraveled via planar tunneling spectroscopy studies
- Harris Pirie, Harvard University
Imaging the Topological Surface States of SmB6
(12 + 3min)
SYMPOSIUM 3 - ThALES - pushing the limits of cold neutron spectroscopy
¨ Organiser: Jiří Kulda
¨ Title: ThALES - pushing the limits of cold neutron spectroscopy
¨ Chairman: Jiří Kulda and Pavel Javorsky
¨ Abstract: Neutron spectroscopy is a crucial tool used to elucidate dynamics of systems with strongly correlated electrons at a microscopic level. The seven contributions in this microsymposium represent, at least partly, a matrix between the capabilities of the new instrument and the scientific topics to be handled on it. On the science side the examples cover a broad range of SCES topics from Kondo insulator physics in Ce-based intermetallics over high-Tc superconducting cuprates and strong spin-orbit coupling ruthenates to quantum spin liquids and magnetism in spin-1/2 systems with frustrated interactions. The experimental results to be presented demonstrate the enhanced capabilities of the new instrument. Its flexible resolution, permits to deal efficiently both with sharp details of the S(Q,w) response function as well as with topologies of diffuse scattering from disordered systems spread over considerable parts of the momentum-energy space. Its excellent signal/noise ratio permits to detect weak signals from spin-1/2 systems. Its completely non-magnetic mechanical parts permit to apply high magnetic fields (up to 15T) in any configuration. Not covered remains the neutron polarisation analysis option, commissioned successfully now but its first results arriving too late for presentation in this microsymposium.
- Jun Zhao Fudan, University, Shanghai, China
Spinon excitations in a triangular lattice quantum spin liquid YbMgGaO4
- Quentin Faure, Université Grenobles Alpes and CEA Grenoble, France
Field-induced quasiparticles driving the quantum phase transition in Ising-like antiferromagnetic spin chain
- Jean-Michel Mignot, LLB Saclay, France
Novel aspects of Kondo insulator physics in 1-2-10 Ce compounds: evidence from neutron scattering
- Evan Constable, Laboratoire Louis Neel, CNRS Grenoble, France
Frustration and anisotropy in a ferromagnetic buckled kagome compound
- Markus Braden, Universität zu Köln, Köln, Germany
Low-energy magnetic excitations in the layered ruthenates Sr2RuO4 and Ca2RuO4 studied by inelastic neutron scattering
- Linda Udby, Niels Bohr Institute, University of Copenhagen, Copenhagen, DK
Controlling electronic phase separation in hole-doped high-temperature superconductors
- Henrik Jacobsen, Niels Bohr Institute, University of Copenhagen, Copenhagen, DK
On the nature of static and dynamic magnetic stripes in cuprate high-temperature superconductors
SYMPOSIUM 4 - Mysterious Hidden Order in URu2Si2 into its 4th Decade
¨ Organiser: Peter Oppeneer
¨ Title: Mysterious Hidden Order in URu2Si2 into its 4th Decade
¨ Chairman: Peter Oppeneer, John Mydosh
¨ Abstract: The discovery of the Hidden Order (HO) phase in the uranium heavy-fermion compound URu2Si2 was first reported in three seminal papers published 1985/1986. Since then, much experimental and theoretical work has been devoted to uncovering the origin of this mysterious long-range ordered phase that appears at temperatures below 17.5K. In spite of three decades of intense efforts, the Hidden Order phase has shown to be remarkably resistive to its uncovering and, as yet, there is no consensus as to its fundamental origin. New experimental techniques and theoretical approaches have been unleashed on the HO recently, providing fresh information. In this Symposium several of the recent experimental and theoretical results on URu2Si2 will be presented, with a view of reaching a deeper understanding of its anomalous behavior.
- Marie-Aude Méasson, Université Paris Diderot
Raman spectroscopy of the Hidden Order and Kondo physics in URu2Si2
- Kristian Haule, Rutgers University
Chiral density wave with local hexadecapole order parameter as the hidden order in URu2Si2.
- Dirk van der Marel, Université Genève
Electronic structure and collective modes of URu2Si2 as revealed by optical probes
- William Knafo, Lab. Nat., Toulouse
Magnetic-field-induced spin-density wave in URu2Si2
- Hiroshi Amitsuka, Hokkaido University
Experimental tests of broken tetragonal symmetry in Hidden Order of URu2Si2.
SYMPOSIUM 5 - Non-equilibrium manipulation of correlated artificial solids
¨Organiser: Claudio Giannetti and Massimo Capone
¨ Title: Non-equilibrium manipulation of correlated artificial solids
¨ Chairman: Claudio Giannetti and Massimo Capone
¨ Abstract: The possibility to selectively excite specific degrees of freedom in correlated metal oxides is opening the way for the creation of emergent metastable states that have no counterpart at equilibrium. One of the big challenges of current research is the combination of ultrafast techniques, which allow to manipulate the orbital occupation on timescales shorter than the internal thermalization, with electrical bias, that can drive the collapse of the Mott gap, to achieve the ultrafast and reversible control of the conductivity of correlated materials.
A parallel direction towards the control of oxides is given by the ability to tailor at the atomic level the construction of artificial blocks and heterostructures. This represents an additional knob towards the full control of the macroscopic electronic state of transition metal oxides. In this way one can optimize the functional properties of oxides as well as engineer novel properties different from those of the constituents.
The theoretical research has been challenged by the impressive experimental advances, which led to the development of novel approaches able to treat non-equilibrium properties of correlated materials as well as the emergent properties of heterostructures.
This symposium aim at boosting this research field by bringing together the most distinguished theorists and experimentalists working on the topic.
- Michele Fabrizio, SISSA Trieste
Mott gap collapse in correlated insulators
- Richard D. Averitt, Boston University, Boston
Photoinduced metastable states in correlated films and heterostructures
- Laurant Cario, Université de Nantes, Nantes
Resistive switching in Mott insulators
- Andrew Millis, Columbia University, New York
Correlations in ultrathin films and heterostructures
SYMPOSIUM 6 - Nematicity in bismuth and bismuth-based superconductors
¨ Organiser: Anne de Visser and Kamran Behnia
¨ Title: Nematicity in bismuth and bismuth-based superconductors
¨ Chairman: Anne de Visser and Kamran Behnia
¨ Abstract: The possible realization of electronic liquid crystals has attracted considerable theoretical and experimental attention in the past few years. The electron fluid can partially lose the symmetry of the underlying lattice as a consequence of strong spin-orbit coupling and/or anisotropic Coulomb interaction. Nematicity occurs when electrons spontaneously lose the rotational symmetry of the crystal. In both elemental bismuth and the topological insulator, Bi2Se3, there is a high-symmetry axis in the trigonal plane. A rotation of 2p/3 around this axis keeps the lattice invariant. However, experiments find that the electron fluid (in bismuth) or Cooper pairs (in doped Bi2Se3) do not respect this rotational symmetry. In the case of superconductors this results in a fixed direction of the odd parity two-component order parameter. The symposium brings together experimentalists and theorists who explore nematicity and its manifestations in bulk bismuth, in the Bi-111 surface state at high magnetic fields or in the superconducting states of CuxBi2Se3, SrxBi2Se3 and NbxBi2Se3.
- Mallika Randeria, Princeton University, Princeton
Nematic quantum Hall liquid on the surface of Bismuth
- Yuki Fuseya, Univ. Electrocommunications, Tokyo
Valleys and their nematicity in bulk bismuth
- Vladyslav Kozii, Massachusetts Institute of Technology, Cambridge
Theory of nematic superconductivity
- Lu Li, Massachusetts Institute of Technology, Cambridge
Torque magnetometry on NbxBi2Se3
- Shingo Yonezawa, Kyoto University, Kyoto
Field-angular dependence of the specific heat of CuxBi2Se3
SYMPOSIUM 7 - Kondo physics and 0-pi transition in superconducting nano-devices
¨ Organiser: Václav Janiš
¨ Title: Kondo physics and 0-pi transition in superconducting nano-devices
¨ Chairman: Václav Janiš + Tadeusz Domanski
¨ Abstract: Carbon nanotubes with pronounced electron repulsion and well separated energy levels attached to superconducting leads display a quantum phase transition at low temperatures from a spin singlet to a spin doublet state (0-pi transition). The transition is accompanied by a change of the sign of the Josephson current through the nanotube and a crossing of the Andreev (Shiba-Rousinov) gap states. The quantum critical behavior is strongly influenced by electron correlations on the dot and reflects interplay of superconductivity and Kondo physics. The Symposium will review the present status of preparation of correlated quantum dots in various setups and report on the recent development in experimental and theoretical techniques and methods used to study these nanosystems.
- Jesper Nygård, Niels Bohr Institute, Copenhagen
Subgap states in hybrid single and double quantum dots based on nanowires
- Volker Meden, RWTH Aachen
The Anderson-Josephson quantum dot
- Richard Deblock, Université Paris Sud, Orsay
0-pi quantum transition in a carbon nanotube Josephson junction: Universal phase dependence and orbital degeneracy
- Rok Žitko, Jozef Stefan Institute, Ljubljana
Quantum impurity models for magnetic adsorbates on superconductor surfaces
- Benjamin Heinrich, Freie Universität, Berlin
Orbital Picture of Yu-Shiba-Rusinov Multiplets
- Tomáš Novotný, Charles University, Prague
Perturbation theory for a correlated quantum dot attached to superconducting leads
(12 + 3min)
SYMPOSIUM 8 - Ultrafast dynamics of f-electron systems
¨ Organiser: Tomasz Durakiewicz
¨ Title: Ultrafast dynamics of f-electron systems
¨ Chairman: Tomasz Durakiewicz
¨ Abstract: Recent progress in understanding ultrafast dynamics in correlated systems is made in parallel with development of novel experimental techniques in the ultrafast domain. Addition of time-domain to energy and momentum domains opens new opportunites in probing the correlated states. The ultrafast pump-probe techniques utilizing different excitation and probing sources are now entering the well established field of f-electron research. In comparison to d-electron systems, in f-electrons the energy scales are small, and often multiple mechanisms lead to formation of energy scales which overlap in magnitude and location on a phase diagram.The complexity of f-electron systems and a multitude of unanswered questions provides an excellent opportunity for the novel ultra-fast techiques to make a transformative difference in our understanding of f-electron hybridization, development of coherence, magnetism and superconductivity, quantum criticality and non-Fermi liquid phenomena, while providing helpful feedback allowing the much needed progress of many-body theories.
To mention just a few problems in the center of interest to the community, that will be discussed: interplay and coupling between different order parameters seen in heavy fermion materials leads to a wide spectrum of low temperature states depending on the interactions between coherent heavy electrons and localized f-electron spins. Ultrafast optical spectroscopy (UOS) can provide insight into the electronic structure of heavy fermion materials that cannot be obtained through other experimental techniques. Time-resolved reflectance studies of itinerant antiferromagnet UNiGa5 and heavy fermion superconductor PuCoGa5 reveal the relaxation dynamics of photoinduced quasi-particles and provides a way to probe the finer features of the electronic structure near the Fermi level. Femtosecond time-resolved spectroscopy of heavy fermions and Kondo insulators, shows the sensitivity of the carrier relaxation dynamics to the presence of the gap in the density of states near the Fermi level. A novel, ultra-fast infrared nanoscopy is a new method that enables spectroscopic pump-probe measurements with the spatial resolution down to 10 nm, and reveals elusive photo-induced electronic and magnetic phases that only occur at the nano-scale in these materials in correlated oxides.
The symposium on ultrafast dynamics in heavy electron systems will allow presentation of results of recent research in this novel field. It will also be a forum to look forward, identifying the future directions, bottlenecks and areas of interest in exploring ultrafast dynamics of f-electron systems.
Reference: Electrodynamics of correlated electron materials, Basov, DN; Averitt, RD; van der Marel, D; Dressel, M; Haule, K, Rev. Mod. Phys. 83 (2011) 471
- Tom Devereaux, Stanford University, Stanford
Ultrafast spectroscopies in strongly correlated systems
- Uwe Bovensiepen, University Duisburg-Essen, Duisburg
Laser-driven ultrafast magnetization dynamics in lanthanide ferromagnets
- Dimitri Basov, Columbia University, New York
Elusive electronic and magnetic phases in correlated oxides: insights from nano-optics
- Denis Vyalikh, TU Dresden, Dresden
Kondo and exchange magnetic interactions in RERh2Si2 systems: Perspectives for time-resolved studies
- Rohit Prasankumar, Los Alamos National Lab., Los Alamos
Unraveling the interplay between electronic and magnetic phenomena in heavy fermion materials
- Jure Demsar, Johannes Gutenberg University, Mainz
Probing hybridization gaps in heavy electron systems with time-resolved spectroscopy
- Diyar Talbayev, Tulane University, New Orleans
Quasi-particle dynamics in UNiGa5 and PuCoGa5
SYMPOSIUM 9 - Quantum phase transitions in multipolar heavy fermion systems
¨ Organiser: Silke Paschen
¨ Title: Quantum phase transitions in multipolar heavy fermion systems
¨ Chairman: Silke Paschen + Stephen Julian
¨ Abstract: Quantum criticality and non-Fermi liquid behavior have frequently been studied in heavy fermion systems near antiferromagnetic order. Recently, a variety of heavy fermion materials have emerged in which multipolar degrees of freedom apparently play a central role in driving the quantum critical behavior. Theoretical models for such systems involve exotic Kondo interactions with symmetries that are enhanced from the usual spin 1/2 case, and may also be realized in mesoscopic systems. This session will feature a coherent exposition on this emergent topic and promises to fascinate with exciting new developments.
- Alix McCollam , Radboud University & Nijmegen High Field Magnet Laboratory, Nijmegen
Composite nuclear and electronic order in antiferroquadrupolar PrOs4Sb12
- Satoru. Nakatsuji, ISSP University of Tokyo, Tokyo
Quadrupolar quantum criticality and heavy fermion superconductivity in PrT2Al20
- Qimiao Si, Rice University, Houston
Global Phase diagram in antiferromagnetic and multipolar heavy fermion systems
- David Goldhaber-Gordon, Stanford University, Stanford
Emergent symmetries and quantum phase transitions in quantum-dot-based many-body systems
SYMPOSIUM 10 - Heading for new shores with YbRh2Si2: superconductivity, multicriticality, and new spectroscopy
¨ Organiser: Christoph Geibel
¨ Title: Heading for new shores with YbRh2Si2: superconductivity, multicriticality, and new spectroscopy
¨ Chairman: Christoph Geibel and Jeroen Custers
¨ Abstract: In the last year, the well-known - but controversially discussed - heavy fermion system YbRh2Si2 was at the origin of a number of intriguing and remarkable discoveries. The most astonishing one was the report of a superconducting transition at only 2 mK. It was suggested that the onset of a combined nuclear-electronic order at 2 mK weakens the antiferromagnetic state formed at higher temperatures and thus induces superconductivity. However, because of the tremendous difficulties in measuring bulk physical properties at such low temperatures, as well as the problems in setting up a specific model for such a complex system, both the experimental results and the proposed scenario met some skepticism. In order to shed more light into this astonishing discovery, new groups took up the challenge to determine further bulk properties at such ultralow temperatures and shall present and discuss their latest results at the symposium.
But also new data on YbRh2Si2 at higher temperatures provided sources of excitement. A study of the phase diagram as a function of Co substitution and magnetic field provides evidence that for field applied along the c axis, the previously thought quantum critical point is a multiple quantum critical point. This opens new directions for explaining the unusual properties of this compound. Furthermore, since similar multicritical points are now discussed in other compounds, YbRh2Si2 might become a paradigmatic system for studying and understanding these multicritical points. From a different aspect, YbRh2Si2 has already turned out to be a fantastic playground for studying Lifshitz transitions. The mixing of 4f states and valence states results in very flat bands at the Fermi level, which can easily be tuned by a moderate magnetic field, resulting in several Lifshitz transitions in a field range of just a few Tesla. Recently it was shown that transport properties, especially thermopower, may provide detailed insight, at level of spectroscopic techniques, into the changes of the Fermi surfaces connected with these Lifshitz transitions.
- John Saunders, Royal Holloway Univ. London, London
The resistive transition to superconductivity in YbRh2Si2
- Silke Paschen, Vienna University of Technology, Vienna
Electrical transport properties of YbRh2Si2 at ultralow temperatures
- Alexandre Pourret, University of Grenoble Alpes and CEA, Grenoble
Transport spectroscopy of the field induced cascade of Lifshitz transitions in YbRh2Si2
- Manuel Brando, Max Planck Institute for Chemical Physics
The Quantum Multicritical Point of YbRh2Si2
SYMPOSIUM 11 - Magnon-phonon coupling in multiferroic systems
¨ Organiser: Je-Geun Park and Stanislav Kamba
¨ Title: Modern trends in multiferroics
¨ Chairman: Stanislav Kamba + Filip Kadlec
¨ Abstract: Multiferroic symposium will be focused on recent progress in theoretical and experimental studies of magnetoelectric multiferroics, measurement and understanding of static and dynamic magnetoelectric coupling, studies of spin excitations etc. Novel sophisticated methods for preparation and characterization of new multiferroics with critical temperatures above room temperatures will be demonstrated.
- Je-Geun Park, Seoul National University, Seoul
Magnon-phonon coupling in multiferroic systems
- Randy Scott Fishman, University of Tennessee, Knoxville
The Microscopic Model for the Room-Temperature Multiferroic BiFeO3
- Manfred Fiebig, ETH Zürich, Zürich
Domain dynamics in multiferroics
- Kenta Kimura, Osaka University, Osaka
Magnetoelectric response from magnetic quadrupole order in square cupola antiferromagnets
- Sándor Tóth
Electromagnon dispersion probed by inelastic x-ray scattering in LiCrO2
SYMPOSIUM 12 - Novel electronic and magnetic phases in correlated relativistic oxides
¨ Organiser: Sergii Khmelevski and Cesare Franchini
¨ Title: Novel electronic and magnetic phases in correlated relativistic oxides
¨ Chairman: Sergii Khmelevski and Cesare Franchini
¨ Abstract: The symposium is focused on recent theoretical and experimental advances in spin-orbit physics in 5d transition metal oxides. In these systems the competition between electronic correlation and strong spin-orbit coupling drive the onset of many exotic electronic and magnetic ground states characterized by tunable bandgap and large anisotropic magnetic interactions (Kitaev and/or spin-compass like). The proximity to a Mott metal-insulator transition in a relativistic background makes 5d oxides quite distinct from other classes of correlated materials and represents a novel paradigm in contemporary condensed matter physics. This symposium includes four invited talks: two experimental overviews on magnetic excitations and kitaev models in iridates, and two theoretical works, focused on the subtle entanglement between magnetism, spin-orbit coupling and electron correlation.
- Bumjoon Kim, Max Planck Institute for Solid State Physics, Stuttgart
Unconventional magnetic excitations in pyrochlore and honeycomb lattice iridates
- Bongjae Kim, University of Vienna, Vienna
Spin-orbit coupling induced renormalization of electronic correlation in 5d-oxides
- Seiji Yunoki, RIKEN Japan
Exotic ground states of a multi-orbital Hubbard model with a strong spin-orbit coupling
- Philipp Gegenwart, University of Augsburg
Kitaev model in iridates
Welcome Party – sponsored by Cryogenic
Sunday, 16 July, 18:00 – 20:00
Included in the registration fee
All conference participants are cordially invited to take part in the Welcome party which will be held at congress venue in the exhibition area.
The evening is conceived as informal opportunity to greet colleagues. Light cocktail refreshment will be served.
Thursday, 20 July, 19:00 – 22:00
35 Eur / guest
Conference dinner will take place in Club Lávka which is situated in a historical building of Smetana´s musem in the very city centre of Prague. T
he club is in close proximity of Charles Bridge and offers suberb view to the Charles bridge and Prague Castle.
Participants will have possibility to enjoy traditional Czech cuisine.
Transfer from the conference site will not be provided.
The Lávka Club (address: Novotného lávka 201/1, see: http://www.lavka.cz/contact/) is easily accessible by public transportation from the conference by taking the metro line B from Vysočanská to Národní třída where you take a tram Nr. 2 or 18 and go two stops to Národní divadlo; from there you walk for 5 minutes along the river bank (Smetanovo nábřeží) enjoying the beautiful view to Charles Bridge and Prague Castle.
This journey takes approximately 25 minutes.
Alternatively, you can walk from Národní třída to Lávka Club (about 12 minutes).
Guided Tour of Prague for Accompanying person
Tuesday, 18 July, 9:00 – 12:30
Comfortable shoes – please kindly note this is a WALKING TOUR!
Included in the registration fee of Accompanying person
The tour starts and ends at Clarion Congress Hotel Prague with English speaking guide.
During this tour you will go along the „royal route“ and see the most famous sights of Prague such as Municipal house, Old Town Square with its Astronomical Clock (medieval world wonder from 15 th century), Charles bridge with its statues and Prague Castle (Hradčany), which is registered as the biggest castle complex in the world.